<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
        const AppContext = React.createContext({});
        function Header(){
            const {count} = React.useContext(AppContext);
            return <div><h2>Header:{count}</h2></div>
        }
        function Footer(){
            const {count} = React.useContext(AppContext);
            return <div>
                <h2>Footer:{count}</h2>
                </div>
        }
        function App(){
            const [count, setCount] = React.useState(0);
            return (
          <div>
            <h1>App</h1>
            <AppContext.Provider value={{ count, name: "xiaowang" }}>
              <Header />
              <Footer />
            </AppContext.Provider>
          </div>
        );
        }
        ReactDOM.createRoot(document.getElementById("app")).render(<App />);
    </script>
</body>
</html>